Submitted to: Proceedings Wisconsin Annual Potato Meetings
Publication Type: Proceedings
Publication Acceptance Date: January 23, 2009
Publication Date: February 3, 2009
Citation: Jansky, S.H. 2009. Progress toward breeding for Verticillium wilt resistance. Proceedings Wisconsin Annual Potato Meetings. 22:37-40. Technical Abstract: Verticillium wilt is a persistent and serious problem in potato production. Host plant resistance offers an attractive long-term control method. Breeding progress depends on access to germplasm carrying resistance genes. This study was carried out to identify sources of Verticillium wilt resistant germplasm in U.S. potato breeding programs. Three trials were planted in 2008. Each consisted of 50 advanced selections from the U.S. potato breeding programs, along with the cultivars Atlantic, Megachip, Millenium Russet, Ranger Russet, Red Norland, Russet Burbank, Superior and White Pearl. Trial A was planted on a fumigated field and was used to evaluate maturity and yield. Trial B was planted on a nearby field that was inoculated with V. dahliae in 2006 and has been maintained as a VW screening plot. Yield and colonization of senescing vines were measured in this trial. Trial C was also planted on the inoculated field and was destructively sampled during the summer to evaluate colonization of green stems. Clones were ranked for yield loss, stem colonization, and symptom expression and then the sum of the ranks was calculated. The most resistant cultivars were Atlantic and Megachip. Clones from the Michigan, Maine, Wisconsin, and USDA (Beltsville) programs were among the 10 most resistant clones.